Valve.



No. 703,963. Patented July |902` c. P. LYNCH.

VALVE.

-(Appication filed Dec. 6, 1901,)

(No Model.)

UNiTnD STATES CHARLES I. LYNCH, OF ST. LOUIS, MISSOURI, ASSIGNOR' TO ST.LOUIS UNIVERSITY, SOURI.

OF ST. LOUIS, MISSOURI, A CORPORATION OF MIS- VALVE.

SPECIFICATION fol-ming part of Letters raten@ No. 703,963, dated July 1,ieoa.

Application filed December 6, 1.901. Serial No. 84,935. (No model.)

To @Utah/0771, t Amag/rconccrn:

Be it known that-1, CHARLES P. LYNCH, aV citizen of theUnitedStates,resjidingin the city of St. Louis, State of'Missouri, haveinvented a certain new and useful VImprovement inV Valves, of which thefollowing is a full, clear, and exact description, such-as will enableothers skilled in the art to which it appertainsto make and use thesame, reference being had to the accompanying drawings, forming part ofthis specification, inwhich- Y Figure 1 is a central vertical sectionalelevation, certain of the parts being shown in side elevation. Fig. 2 isa view generally similar to Fig. 1, the vparts being shown in a dierentpositionyand Fig. 3 isa top plan view, partlyin section, o n the line 33 of Fig. 1.

My invention relates to improvements in valves, and more particularly tovalves in which packing is unnecessary, my object being to provide anefiicientand convenient structure in which leaking is Wellguardedagainst.

To this end and also to improve generally upon devices of thecharacterindicated my invention consists in the various matters hereinafterdescribed and claimed.

Referring now more particularly to the drawings, 1 indicates the globeor main portion of the valve-casing, having the usual seat 2.

3 indicates the extended sleeve portion of the casing, and 4 is the capfor closing the upper end of the same.

5 refers to the valve-stem, provided with the usual hand-wheel 6, and 7indicates the valve, which is suitably supported upon the lower end of asleeve 8f Said sleeve is interiorly threadedand is engaged by the lowerthreaded end 9 ofthe valve-stem, suitable vertical slots 10 in theperiphery of the sleeve receiving guide-wings 11 upon the casing,whereby rotation of the valve-stem serves'to raise or lower the `valvewithout rotating the same,

and thus grinding it upon its seat.

Near its upper end the valve-stem is provided with'an enlargement 12,whose Yupper surface is rounded and turned to closely iit a seat 13 inthe under surface of the cap 4, the

Aby said enlargementfis held to its seat. about the point offthevalve-stem which lies lower portion of said enlargement extending intothe bore `of the casing portion 3. Immediately below the saidenlargement the casing-wall extends inwardly a short distance to producea shoulder,which lies runder the edge of the said projection, and atasuitable point below said shoulderli the casing-wall again extendsinwardlyyto produce a shoulder 15,

a spring 16 being coiled about the stem and bearing 'between said'fshoulder 15 and the under surface of the enlargement l2, whereinV linewith the shoulder .151:When the parts are assembled said'stem isprovided with a collar 17, which is of slightly less diameter than thediameter of the coiled spring, Wherebysaid collar.` does not interferewith the proper seating ofthe spring upon the shoulder 15, but preventsaccidental separation of the spring from ,the stem when the stem iswithdrawn from the casing. For the sake of illustration the spacebetween the shoulder 14 and the under surface of the enlargement 12 isexaggerated. In practice, however, this space is somewhat less thanonethirty-second of an inch inafull-sized valve, whereby anyconsiderabledepression of the valve-stem by the operator when turning the same isprevented.

As is shown in Fig. 2, the proportions and arrangement of the parts aresuch that the end of the stem is seated against the end of the sleeve 8before the said sleeve or the valve engages any portion of the casing.Thus when the valve is fully raised further rotation of the stem in thedirection for raising said valve and sleeve is impossible. This isimportant, for were the upward movement of the sleeve to be arrestedbefore-the stem has reached the limit of its movement further rotationof said stem would cause the same to further enter the sleeve, andlin sodoing the enlargement 12 would be drawn away'from its seat 13 againstthe action of the spring 16, thus permitting leakage through the capabout the stem.

The present construction of valve is simple in its construction andefficient in operation,

the parts being readily made and assembled, excessive depression of thevalve-stem being avoided, withdrawal of the enlargement from its seat bythe rotary movement of the stem being prevented, and the accidentalseparation of the spring from the stem when the parts are withdrawn fromthe casing being guarded against.

I am aware that many minor changes in the construction, arrangement, andcombination of the several parts of my device can be made andsubstituted for those herein shown and described without in the leastdeparting from the nature and principle of my invention.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-fl. In a valve, a valve-casing, avalve-stem, a cap having a seat in its lower face, an enlargement uponsaid stem fitting said seat, and a fixed casing portion extending undersembled, said collar engaging said spring but` being of less diameterthan the same; substantially as described.

In testimony whereof I hereunto affix my signature, in the presence oftwo witnesses, this 3d day of December, 1901.

CHARLES I). LYNCH.

Witnesses:

GEORGE BAKEWELL, GALEs P. MooRE.

